CO Oxidation on Pt(100): New Insights based on Combined Voltammetric, Microscopic and Spectroscopic Experiments

Rudnev, Alexander; Kuzume, Akiyoshi; Fu, Yongchun; Wandlowski, Thomas (2014). CO Oxidation on Pt(100): New Insights based on Combined Voltammetric, Microscopic and Spectroscopic Experiments. Electrochimica acta, 133, pp. 132-145. Elsevier Science 10.1016/j.electacta.2014.04.034

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We present an experimental study of the CO electro-oxidation on Pt(100)-(1 × 1) electrodes employing electrochemical methods in combination with in situ scanning tunneling microscopy (STM) and shell-isolated nanoparticle enhanced Raman spectroscopy (SHINERS). We discussed the nature and stability of the active sites in the preignition region in the presence of dissolved CO (COb) and monitored substrate structure changes during the COb electro-oxidation process. We corroborated that the electro-oxidation kinetics is determined decisively by the history of CO adlayer formation. A new mechanism was proposed for Pt(100) electrode deactivation in the preignition region after excursion of electrode potential to COb ignition region. We believe that this mechanism takes place on Pt surfaces independently on their crystallographic orientation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Rudnev, Alexander; Kuzume, Akiyoshi; Fu, Yongchun and Wandlowski, Thomas

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science

ISSN:

0013-4686

Publisher:

Elsevier Science

Language:

English

Submitter:

Beatrice Niederhauser

Date Deposited:

26 Mar 2015 10:59

Last Modified:

25 Aug 2015 10:27

Publisher DOI:

10.1016/j.electacta.2014.04.034

BORIS DOI:

10.7892/boris.65949

URI:

https://boris.unibe.ch/id/eprint/65949

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